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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7b21c35fd7ad880df3ca8cd8c7a335b552d238dda2e032c863a4496def0b75' 
  AND token = '1gBviHEAAnrePQJZxvZXhcmg2MkpbIa+/c4SHVYxLPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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