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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d041c59e22eb95bce5ff8d0814629233764d2bf358d62f82301088400d379a' 
  AND token = '/1L1bTb2rSpHFAZU41XMx6xdyH4T3Rwmauc1eN2SvH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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