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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9eae496d3b9c914257c3216b3a275e6492e8ae91fa0fa07d129d5ee89bf0522' 
  AND token = 'v/meXACfelTgFXqu/xZoiSNRLf2Cqip788rr4/jIVVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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