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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89c235250629a0b4ad2ce4be96307a6ebead4bf7434f041aad93e19c843ba19' 
  AND token = '4lnT2BgCjmiI7lH9X9rTfJXNIOCN3ubmk3qrXNj9tic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}