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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570f4191affbddfb487a3f3ed76e602a1fecc2562c045be0e5d8ffbce728242b' 
  AND token = 'vPDYcC1smczV0XrQRKZyEuU1Nmz8W4b+RYDxShWfE9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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