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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb28119decc3ca33289ddf1ded49afceaea786b2fe2fbd8a3ef002ae2525d430' 
  AND token = 'Y1w14VZmPMF/ht8Hn1WeyJvUyk5ij9DMFN/DZy29eQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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