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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45590e8acb14cd16fea67bb9566fd0f0e6f0e42659f088f46002356a4ad5ac5' 
  AND token = 'h9ukHIB6gSf4k42DNzQJxp280ly0hi1o7aJloHQVIPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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