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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3662754c2ea5e7b6bc29896adcf0a0a283f0083cdc9d0c54a5c7379600e6ff09' 
  AND token = 'FhSW7xL2LxC/0EddhmQvDYlfqnj5bCXTnlm4lrmJdrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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