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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc80aff13ed06c5bf0ff55e1b23e0f446e86f82a87de67fab0f55731e63a20b9' 
  AND token = 'HX2QYO8SapUcIhV2Qn7eCD5+0fHGn3Xy1dmWQ8yd6ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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