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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd079db062c337a48ec19ca2d2cfbccf80513149e3b6117b7c7a4d60bc026d546' 
  AND token = 'jhbLly/2ybulnu6yr8uEEJeIjlljVfcWlochg0Fsfpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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