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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf7ca2f32632aa1aa6529a20810b28a6a88eceada1b534fdb457750664bd814' 
  AND token = 'AfMlYnukl8pbboC/u7eiv6BQQH3pk92xURwb8cRlK2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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