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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4c2f9d4457c77a72adf2c04cbf2bf214e4ddc89d89f98775427ebfbc1e6306' 
  AND token = 'YXDl35OPYfEDIL6mTKUJHVbdDFNyDOMH+eEL59m1+w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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