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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc7a6b2f3d2768841d351e6620a30d45f0086112c50f9d965d14e82488eef30' 
  AND token = 'iIrq1fvTET+I9vUj0+bctsBOfJjfqgdiAObH2HSQ/YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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