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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fff3ea115878afc6286ddac4d817218ed248b8c3847dea217323d5f0e503246' 
  AND token = 'egcRx8ixzS8P1G52kxpf59uyvp3WkXrFXvT9gmbn4ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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