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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa8bb0799b05a8ecd6679df7a1a02d3c87de1cedba32be989a6fb6dbc7ef536' 
  AND token = 'Y+T2Fc9I0y6zB4fP3XuLCLa4eOblvT0PMg3ZsDvx/Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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