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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad35cb30e2d5a827270670a8626eb9a5847ea966beb50aa78999c88dee367df3' 
  AND token = 'xGMVDN6+blAq8Hs90Pu+ufNGEGpDCUY+fen03RT6bnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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