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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04868283bad2b970230fd0b953ddd57bf1d7064c5ad7767142cf236e811936d' 
  AND token = '1Y777Sg5184OCgIQZK5+Ja5hs0svTsXRBPCaJZ7uCA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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