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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7f3cb4bd00260cccdebc543d290c3b957b77b0f791f192ce0d52538dda40f7' 
  AND token = 'ec74ElrzdwNqEYtBidpiyaG/54SC1i4UXE3YrXvj4l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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