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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363f15138e9d2ee3a85013f02338ae54ee37997ea86515563e1fc23607d3ac21' 
  AND token = 'hOUFQ+gme8oqqKRAyNBkE5A81Qr1b1Q67eLh5dw7784=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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