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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bfc912e1a729b765813ba3ddae6099a312ecc94e3a6bb0ba9fdc43ad3e1817' 
  AND token = 'N2pf1N8mwUhy4fnp6+Kx5miH3KXNMUp5aZBULMHVEo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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