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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0cc9ca2ad6c938dbcfb1e450b5fe1759bd8ee0c1cdfc302a42a18e73d668ea' 
  AND token = 'lKJ8FZyoCZY1YV6z45hoLrj15Rm8aHq46TxQb0nZjrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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