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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fa304390558d3e875582969179d5387ddb61b0da55894dbd4e91faa2168558' 
  AND token = 'fI094NWkaF8pHcQY3WiVMwbuPgCAgs8tnew+fN4MNz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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