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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96c2aa1e22a19d681783964620dad3428e35f57f9bc452f28f85ad7923b4a42' 
  AND token = 'hLt4FsetI5Ke8G230oHWJhr9B2jrJC/vBIi2ZtFtsds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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