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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0987eb068f3546fd982d6a9a161f85e8672b279e2f31fccf30e240f2efaf3098' 
  AND token = '+490SGfu8Y8bVm9f3Zvkynv30xZ8OkQFcpIZq3GrumI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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