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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805e41c6ea00a92033d2ef1de6a647e321efc9059b200e5f7d856c5226b8e36e' 
  AND token = 'rOK/IUYO2vLQebQW1x+s/En7+cltsBjYFIoiTW3TsWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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