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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031d76deffc75d3b1542be4d48add7ddb84a88f2fec3fc13ebf1c9f029b1ba4c' 
  AND token = 'q41OSEemgjKLwkP9bvFErLol9MH0MmJvmrqkbwEOkhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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