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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5832eaa1b0b57717105cdca88524770a8aef42b6e2b5238e558a6ea1eb842c' 
  AND token = 'U5L51CYVmQMc1ZEyZA+egqlVmJK6qw77lPcrSyxWcRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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