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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c19735c6fa4f72e2d68ed798cb495133c74ee7b96e1493c88566b6cc42b2bde' 
  AND token = '+g7rpuORLdzKQInng1bVOO0Cp8B6dYYHVClOXrZRKu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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