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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd539c39db9c614148659ffe5983f71c710d99085ec60c874bcc7001ff6be281b' 
  AND token = 'VGEvXbUh95C1BGtlEypzyJfj/1HiH4AfP/qM7Guv0o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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