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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fbeeb67b641dab042e2c71ef3741537af7c641b576d72b37b00a07e754cf57' 
  AND token = 'T5WIzHozoYWJd+vjpaDNL+y264vz1gL+wdP/4QeRxqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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