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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0aa3256cd8ab37a7412c4a49fce1aa26710cd5ac5ba610b47c5a44ebe033bae' 
  AND token = 'iptj9v1+0fMr9+9y0dDVEJCage+txtGa/rZ8HDx2cvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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