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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c400bea0f73a3c2a9d5724ee04b304565087b8d7d4ff761ffcb8170ac96e98' 
  AND token = 'a670sR7tdvQu7BiHrYzFy/81DmV6YfK90K22gVihi6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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