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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0372f4f9f76ff3b6c7879c7db1c545916a830ecd74e6e0cd5771a05782640c17' 
  AND token = '33avHfdSHk21cekKB3sH2VlxLcIMl25LTWJzJ2J3cl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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