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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa35e9beb888fe507bfe3bf4b336add9cc6f56c001d3c1d45f5f1e9008859360' 
  AND token = '3i2mpXSvf7YzofT8an8W2wReRp6x4SSs4D7WgwTyysE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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