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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c84f0bbb322a60f723c18141b21f60306ba047e5ba3e8fcf6019cce47d08c4' 
  AND token = 'zsIKvNeypJrK6RpKPBvBPsRpROpv+Bho0GIl83gXR1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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