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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6937ab6acfbe0c8bde1b275dc2d0c053008548c505c0981d7e3b15da686211d3' 
  AND token = 'x1DDAc4CYSPYtphU6cOrkc22q+ci2v9EHX9s1DyHtfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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