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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc148f0fe17083062fcce9ecd2c8c20061c939cb0d7ab9ef2a65795dc97c86b3' 
  AND token = 'Wo6/DLvwX6D3Mnd2hHM2eZlXChkxaVCQQZTB+Pa1okc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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