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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0b3e120677253ae0163f6bc25836b4f51c1c8585bc770845eb9dc7447ccd06' 
  AND token = 'BrtEkvH3Em7JgQqv3OgZ2tiAroOyu6z36lmu2Z4dDjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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