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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9c38166a6b5d703779df1100c6fba864cadc9a4f66abae9abbe6afd672322d' 
  AND token = '+IGMH4gvX9iI4IbEtU/HVUmTV/xJVLWvtZJpih5p1n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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