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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd528a1a0916e38a1ce8ac3156ce70f43605365ca7ffae890a20cbeb4a68fc7' 
  AND token = 'l1lKIugb4uYd+d/jDg+RTLrT8DXRUm8zmeG/BSUySOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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