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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ce02c5a3984c477940912909f91e1a95a0e356cef1a00a12f0e2ed8e39549c' 
  AND token = 'ZyHIN9axdOr2YFLf4pVh0MeCFh41hNZoQYCVEcZM4h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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