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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd177e7ff43bf26b597e15aa2a609501c338eb5f610fcc790a3dffbb7ac90e249' 
  AND token = '3MN0P80NsdVoZyMozrS0LLPA3Nq5yopvuJeoogb4VqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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