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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ec43a188880261678ed117502e6a6102fdb4a16afb100283d95881c9a58457' 
  AND token = 'S51kQE5mwdpPXQ55kIgM4uzmBmmYgMmq/v/wzvx1PxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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