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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3e66022a08ce3b69c4311efc4d074ad20c0fb96aeacc8ce0f7dc4f3b5281ee' 
  AND token = 'GevMj6CPwfueNwC/lGJOSjV4zAcKvsfuZTyfw7V4+ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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