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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eedd5eafb19ca85fe70d205472f0a4d22f4d5bacc05f9caf17dbee8f5e897d3c' 
  AND token = 'K8t/LtMicy/6gp6MRPIkHKn+Auz+C4k4wOV2SrPi8SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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