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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f5d293253b979c05ca665ab2ce503db1cd2a1e6220e374f76af52cb2d32729' 
  AND token = '5TwA+BwubMcjn/UvCko0JVCmS+P3he8W+vMUliMDpr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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