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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd400e0d7a1ebe52f76e02b990fb3b20a62becb34c2f74757d53260cbacdb3e6' 
  AND token = '1+eEmN+hBrLhiab07m0h/cmjs4++IG/5gmjeoyx2APk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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