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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5de2932fffe269c82c01b8aa8aec8063fc01611a2e2982581c6dc2f2a61178' 
  AND token = 'v2fazucIMYgcXpmroqjbhhpWcFMQbQI2306IkS5WYO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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