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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bc8bf6cb6a5c064e81fe96030d43e3f2ab20b73e8b8524d2b1bd66117cbacb' 
  AND token = 'ixf/ML/co7z+6XMUu5Gu65OCkjTRb0qFevFKpFitDVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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