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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6beaf852cc55739c0741c18aa599977290a94c1d00710546621fa5ec91b70ee3' 
  AND token = 'N5HAh84khafSMBuw2VduUTwWDSGE7Wpsh5da+5qZqYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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