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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696edb3891969e9142ed1adc0ea865f030a74eaad5237b27e66db4144168c63e' 
  AND token = 'vLhzSo6QA1uZAl91uDbo5oFG0gL3GfWnco9DkufuA8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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