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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b44923e2113aeea8205e558a7978cfb1820d3b36c8f2285d1cd5331e1a7f2c' 
  AND token = 'NgBLYm3umLbLCFpzEjrLPX1UFmLidQOGU4NaMF2DrII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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