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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a119e0bb6156da62086732b73adc68b6348b7e6702d0a03a2e8be98d34729eb1' 
  AND token = 'm+T2tdn/zdM/R8etEeMCT0udN6RGQwqSlqegYyl2KCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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