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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f090fbd080ff0398fd990600763ae4ba18a459a689ea87cc99e95f5a32b4fde' 
  AND token = 'GvVIItI7LLy/30iB/Cq/XC6jphp912+d2J6fonr/hDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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