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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5883a34b26d460eab5edf711320f3efe44568ee59bec3b6fa287f0f836f319' 
  AND token = 'iWc7ywfrJxk6PqR/rbMcZt8baeyDg2VxpytUx8co1KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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