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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8581a6aa31407406a654f84b25ed0ddb99d0c06cf5fc88e7415c9b71ee29e7' 
  AND token = 'sZN32Fb4c8bti3wDtqkZZp4OXGnx03ss5pScsLs6MKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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