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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddae2f07a6025b90f1a0f746340f50015d54b2e5c9accda705c67e17c9fdfc4' 
  AND token = 'M1JQLRuRd5ers2b/P1m4HCG2LVWcSWMxJq2QYXNnLlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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