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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f17d6776d3921e589db2b0d0aa543f64be4728744ffaaa5ef2372ba54b4a18' 
  AND token = 'Pcl0xT7kfomShN/7AxJX+d9BLLLFt6ZWBR45vfqNumI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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