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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69094c4fc1df3a954dcb1ff23d3bfda3de13c0aa6b12ead5e7ecddaa77fc3443' 
  AND token = 'J2xJAoFF2ZF5Ka/OyOiIjzlsZILqM24LAqpy3Q7/4D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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