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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198ab23750647bda7dac359f87df461297af1e8b0346b7a725fdaa0d790c6968' 
  AND token = 'N2+aEzaoG+L1ls2irJgr8UvzHWwK1DFaimiILt6rghQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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