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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbb3fc9b515b5cb1c88d31063f14611f4547280bbdb42238d3eda74b25b2de7' 
  AND token = 'EzHlr81CF3f0q+VrOpG97aoFTXMW+4G6fR74DVzPe3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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