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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1393a24b2a1b2670c64e12a29ba0eaebf75c427f1bb0b1662be2ba23fdf5eb51' 
  AND token = 'g9JxD9MhIYGeFjkcMaOZJ7lgdu1iqUCaD25eqXih9R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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