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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0070ec7673b5ba404c52a7c60e7b5268ee213150c41ab63ab7712b1009250a' 
  AND token = 'UybEQ3Altt4MZyzkzZGEOv5sP+7YmixLUdlxkKVcYJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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