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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c04b88afbe5dd0ec686d998b90b7bea3f3322d177c9538267f31aca7fbfddc3' 
  AND token = 'Ra2Lcofapwttl2aloL5uhSRfQ+lUrrre01olnzoIdS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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