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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193a36cbdad35d9ff0fd6641e5d7e8bd9dd4a01323c96d8e28e866513ba03718' 
  AND token = 'wyTccHAi700o6DILsdxzmQExvP7GCQqnoQJAiPlK0Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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